It will be made from bar stock steel.
Aprox 5/8ths diameter.
A .249 hole will be drilled all the way through.
1.5" oal
.75 depth 10mm hole
.75 depth .249 hole
One end will get the hole enlarged to 10mm
2 small set screw holes will be drilled and tapped at each end to "set" a 1/4" carbide reamer and a 10mm motor shaft.

It will look something like this but NOT have the spiral relief cut and be made of steel.

Ok, I have several alloys in stock: 303, 304, 1018 and some drill rod that could be chucked in the lathe and done up in a couple of hours one evening. PM me if you still need the part. I'm about 15 minutes up Anaheim or PCH or Carson St from from you.